OPTICAL MATERIALS
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2021
·
IF 3.08
Daxue Du,Yulian Zeng,Chenbo Wang,Mingjie Li,Fengyan Wang,Zhaopeng Xu,Haiyan Wang
Monodisperse silica nanospheres with different diameters between 100 and 700 nm were fabricated using a slightly modified Stöber process. Silica nanosphere monolayers in a hexagonal array based on hydrophobically modification were well deposited on top of a bare crystalline silicon solar cell by a Langmuir-Blodgett method. The antireflection effect of various diameter silica nanospheres coatings was simulated using Comsol Multiphysics simulations. Silica nanosphere hexagonal array coatings with four kinds of diameters were fabricated based on results of simulations. The efficiency of solar cells covered by silica nanospheres has improved significantly with a maximum of 11.41% at 119 nm diameter while that of the planar solar cells was 10.17%, which is attributed to the improved photocurrents arising from the broadband antireflection and optical absorption . The antireflection effects produced by Rayleigh (<1/10 wavelength) and Mie scattering (subwavelength) of different diameters silica nanosphere structures were discussed in detail.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Li Shen,Fan Liu,Yao Shen,Cheng Sun,Yuchi Zhang,Qiaoli Wang,Sujing Li,Wei Li
Biphasic solvents have been attracting increasing attention in CO 2 capture recently due to its energy-saving potential. However, most current biphasic solvents still face the problem of limited desorption performance. To solve the problem, a novel biphasic solvent of 1-(2-aminoethyl)piperazine (AEP)/1-propanol/H 2 O solution was proposed. The absorption capacity was 1.26 mol CO 2 ·mol −1 amine, which was 2.3 times that of MEA. The regeneration efficiency was 74% and the cyclic capacity after 5 absorption-desorption experiments was 0.90 mol CO 2 ·mol −1 amine, which was 2.7 times that of MEA. The absorption-desorption performance of AEP/1-propanol/H 2 O solution was much better compared with most current biphasic solvents. Meanwhile, AEP/1-propanol/H 2 O solution had a low regeneration heat of 2.74 GJ·t −1 -CO 2 , which was 27.9% lower than that of MEA. Moreover, 13 C NMR analysis was used to investigate the absorption-desorption mechanism and species distribution. The multiple amino groups in AEP could react with CO 2 to produce carbamate and carbonate. The generated absorption products were mainly concentrated in the CO 2 -rich phase, while the CO 2 -lean phase contained much 1-propanol. Most of the absorption products were decomposed during regeneration, so the high desorption performance was achieved. Overall, AEP/1-propanol/H 2 O solution is a promising energy-saving candidate for industrial CO 2 capture due to its competitive absorption-desorption performance and low regeneration energy.
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Journal of Analysis and Testing
·
2021
·Vol. 5
·期 4
·387-395
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IF 0
Zhou Yufeng,Duan Liguang,Huang Yixin,Liu Yaqi,Wang Lijuan,Qiao Xiaoqiang
The amino acids post-modified ionic liquids-based hybrid monolithic columns were successfully developed. For the first step, using 1-vinyl-3-dodecylimidazole bromide (VDI·Br) and polyhedral oligomeric silsesquioxane methacryl substituted (POSS-MA) as monomer and crosslinking agent, the monolithic POSS-VDI matrix material was polymerized in 100 μm capillary. The prepared POSS-VDI column is of ion-exchange/reverse-phase mixed-mode retention characteristics. The column efficiency reached 137,000 N/m for thioureas. The POSS-VDI column has also been successfully applied to recognize and analyze the effective components of Traditional Chinese Medicines Fangji and the Root of Kudzu Vine. Furthermore, based on its good chromatographic performances, in the second step, amino acids l -Proline ( l -Pro), Glycine (Gly) or DL-Phenylalanine (DL-Phe) were further exploited as the anion exchangers to post-modify the POSS-VDI column. The new POSS-VDI-Pro, POSS-VDI-Gly and POSS-VDI-Phe columns exhibited different separation selectivity for the complex egg white protein sample. The present work provides a good route to fabricate versatile amino acids and ionic liquids modified monolithic columns with good separation selectivity.
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MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Yawen Zhang,Xia Wang,Xiang Fang,Xianxian Yuan,Huaixia Yang,Jinming Kong
As importance of early diagnosis, prognosis, and clinical monitoring in improving survival rate of lung cancer is increasing, the advance of effective diagnostic method for tumor marker is crucial. Herein, linear poly( ε -caprolactone)- b -poly(ethylene oxide) (PCL-PEO) copolymer with hydrophilic property is applied to detect CYFRA 21-1 in label-free electrochemical immunoassay. 4-(2-trimethylsilylethynyl)benzoic acid (TEB) as “bridge” bond first connects initial antibody to the surface of gold electrode. Then one side of CYFRA 21-1 antigen can recognize with initial antibody of electrode interface, and the other side hybridize specifically secondary antibody grafted PCL-PEO copolymer. So far we have constructed a complete immunoassay for CYFRA 21-1 detection using electrochemical impedance spectroscopy. The sensitivity and selectivity of analytical method depend on “Au–C” bonding, specific recognition of “antibody-antigen–antibody sandwich”, and PCL-PEO copolymer. Under optimal conditions, the analytical method for quantitative detection of CYFRA 21-1 manifests a broad linear range (1 pg/mL–10 ng/mL) and a low detection limit (0.125 pg/mL, about 3.47 × 10 -15 M). Furthermore, according to the analysis results in clinical samples, the constructed strategy also shows satisfactory sensitivity and anti-interference. It indicates that the immunoassay has broad promising applications for expecting to be applied in practical clinical prevention and monitoring.
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Food Additives and Contaminants Part A-Chemistry Analysis Control Exposure & Risk Assessment
·
2021
·
IF 3.057
Qinqin Xu,Zikai Liu,Chen Yan,Runhua Lu,Wenfeng Zhou
In this study, a novel sorbent, 1-octyl-3-methylimidazolium hexafluorophosphate functionalised magnetic poly β-cyclodextrin, was successfully synthesised and applied to magnetic solid-phase extraction for the determination of pyrethroids in tea infusions. The sorbent was characterised by transmission electron microscopy, energy-dispersive spectroscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, vibrating sample magnetometer and Brunauer–Emmett–Teller measurement. All factors affecting extraction efficiency, such as sorbent amount, extraction time, ionic strength and desorption conditions, were optimised individually. Under the chosen conditions, wide linearity (2.5–500 μg L−1) with determination coefficients ranging from 0.9995 to 0.9999, low limits of detection of 0.32–0.54 μg L−1 and good precision (intra-day: 2.6–7.0%; inter-day: 3.5–7.6%) were achieved for four pyrethroids in tea infusions. The relative recoveries of target analytes in real tea infusion samples were from 70% to 101% with relative standard deviations lower than 9.1%. We conclude that the proposed method is promising in the detection of pyrethroids in tea infusions.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Chun Bai,Kexin Li,Dezhen Fang,Xiushen Ye,Huifang Zhang,Quan Li,Jun Li,Haining Liu,Zhijian Wu
A novel flotation agent named N-octadecyl-N-methyl- D -glucamine (NO-NMDG), was designed and prepared using N-methyl- D -glucamine as a polyhydroxy molecule and 1-bromooctadecane as the provider of a long-chain alkyl group . The results of characterization by NMR, MS and FT-IR showed that the target compound was successfully synthesized. NO-NMDG can effectively separate boron from aqueous solutions because of its complexing ability for boron and its foamability. The flotation experiments results showed that the flotation isotherm was in better accordance with the Langmuir model, indicating that the surface reaction in flotation by NO-NMDG belongs to the single molecular layer trapping. The response surface experimental results indicated that under the optimum conditions, the boron recovery rate can reach to 89.12%. The boron recovery rate in Xiao Chaidan brine could reach to 97.26% by NO-NMDG. The mechanism analysis exhibited that the meglumine group in NO-NMDG can complex with boron, and the long-chain alkyl group can attach to the surface of the bubble and enter into the bubble layer to separate boron from the aqueous solution.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Renxin Wang,Yuanzuo Zou,Jingzhou Guo,Yuan Pu,Dan Wang
1,3,5-Tris(1-phenyl-1H-benzimidazol-2-yl)benzene (TPBi) is normally used as functional materials in organic light-emitting diodes (OLEDs) and the information about the solubilities of TPBi in organic solvents is crucial for the preparation of inks toward inkjet printing technology, which is considered to be a next-generation manufacturing method for OLED production. The solubilities of TPBi in 12 kinds of organic solvents, including n-hexane, cyclohexane, methanol, ethanol, isopropanol, n-butanol, acetonitrile, ethyl acetate, dimethyl sulfoxide, tetrahydrofuran, chlorobenzene, and trichloromethane, at the temperature range from 283.15 to 323.15 K and atmospheric pressure were determined based on the isothermal saturation method. The obtained solubility data were correlated by the modified Apelblat equation and the correlated results exhibited good agreement with the experimental data. The nanonization of TPBi was conducted via high gravity-assisted solvent/antisolvent precipitation processing, which showed a beneficial effect for film formation.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jingdong Li,Arthur Listwan,Jianxing Liang,Feng Shi,Kan Li,Jinping Jia
In this work, defect-rich 1 T-MoS 2 nanosheets are successfully synthesized by solvothermal method with acetic acid as the templating agent. It is found that changing the concentration of acetic acid can regulate the proportion of 1 T phase and affect the activity of hydrogen evolution. Under the optimum concentration of acetic acid, the overpotential is as low as 136 mV at the current density of 10 mA cm −2 with a Tafel slope at only 45 mV dec −1 , which shows an attractive potential for the development of electrocatalytic hydrogen evolution. In addition, the addition of acetic acid prevents the agglomeration of 1 T-MoS 2 and thus increases the stability of electrode materials, which is conducive to the long-term hydrogen evolution reaction and cost control. Most importantly, according to comparing several small molecular carboxylic acids, the probable formation mechanism of 1 T-MoS 2 nanosheets is proposed.
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CATALYSIS LETTERS
·
2021
·Vol. 151
·期 9
·2513-2526
·
IF 3.186
Cui Kai,Qian Wei,Shao Zhengjiang,Zhao Xiuge,Gong Honghui,Wei Xinjia,Wang Jiajia,Chen Manyu,Cao Xiaoming,Hou Zhenshan
Furfural (FFR) is one of the most important biomass-derived chemicals. Its large-scale availability calls for the exploration of new transformation methods for further valorization. Herein, we demonstrate that Ru nanoparticles (Ru NPs)-supported on a sulfonated carbon layer coated SBA-15 can be employed as an efficient bi-functional catalyst for one step conversion of FFR into 1,4-pentanediol (1,4-PeDO). The optimum bi-functional catalyst can afford the full the conversion of FFR and 86% selectivity to 1,4-PeDO. The catalysts have been characterized thoroughly by using a complementary combination of powder X-ray diffraction, N 2 adsorption–desorption, scanning/transmission electron microscopy, Fourier transform infrared spectroscopy, elemental analysis, and X-ray photoelectron spectroscopy. The characterization revealed that acidic groups (–SO 3 H) have been introduced on the surface of the carbon layer coated SBA-15 support after sulfonation with 98% H 2 SO 4 and the surface acidity can be tuned facilely by the sulfonating time. Meantime, Ru(0) sites was highly dispersed via an impregnation and sequential reduction and directly adjacent to the surface –SO 3 H group. There existed an electronic interaction between Ru(0) sites and sulfonic groups, in which the electronic transfer from sulfonic sites to Ru(0) sites occurred. Brönsted acid sites (–SO 3 H) have a significant influence on the FFR conversion and the selectivity to 1,4-PeDO. The ordered mesoporous structure, the appropriate density of acid sites and the electron-rich Ru(0) sites accounted for the the excellent performance of the catalyst for an efficient production of 1,4-PeDO from FFR. Graphic Abstract
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CELLULAR ONCOLOGY
·
2021
·Vol. 44
·期 3
·557-568
·
IF 6.73
Wang Wanyue,Li Xin,Xu Ye,Guo Weikang,Yu Hui,Zhang Lu,Wang Yaoxian,Chen Xiuwei
Purpose Cervical cancer remains a major cause of cancer-related death in women, especially in developing countries. Previously, we found that the acetylation levels of chloride intracellular channel 1 (CLIC1) at lysine 131 were increased in cervical cancer tissues using a label-free proteomics approach. The aim of this study was to further determine the role of CLIC1 expression and its acetylation in cervical cancer. Methods CLIC1 expression and its implications for the prognosis of cervical cancer were analyzed using primary patient samples and cells, and the Gene Expression Profiling Interactive Analysis (GEPIA) database (gepia.cancer-pku.cn). The effect of CLIC1 on cervical cancer cells was evaluated using Cell Counting Kit (CCK)-8, flow cytometry, scratch wound healing, transwell, Western blotting and co-immunoprecipitation (Co-IP) assays. In vivo tumor growth was assessed using mouse xenograft models. Results We found that CLIC1 expression was increased in cervical cancer tissues and cells and that patients with a high CLIC1 expression tended to have a shorter overall survival time. Knockdown of CLIC1 significantly reduced in vitro cervical cancer cell proliferation, migration and invasion, and in vivo tumorigenesis. At the molecular level, we found that nuclear factor kappa B (NF-κB) activity was positively regulated by CLIC1. Pyrrolidine dithiocarbamate (PDTC), an inhibitor of NF-κB, attenuated the tumor-promoting effect of CLIC1. Moreover, we found that CLIC1 acetylation at K131 was upregulated in cervical cancer cells, which stabilized CLIC1 by inhibiting its ubiquitynation. Substitution of K131 inhibited CLIC1 ubiquitynation and promoted in vitro cervical cancer cell proliferation, migration and invasion, and in vivo tumor growth. In addition, we found that acetyltransferase HAT1 was responsible for CLIC1 acetylation at K131. Conclusion Our data indicate that CLIC1 acts as a tumor promoter in cervical cancer, suggesting a potential treatment strategy for cervical cancer by regulating CLIC1 expression and/or acetylation.
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Journal of Functional Foods
·
2020
·
IF 3.701
Lvqi Zhou,Ning Hao,Xiaotian Li,Jiaxi Chen,Runyu Yang,Changqin Song,Yang Sun,Qi Zhang
In this study, we investigated the protective effect of Nattokinase (NK), the most active ingredient in natto used for healthcare, on dextran sulfate sodium (DSS)-induced chronic colitis and unraveled the potential mechanisms. NK dramatically attenuated clinical symptoms and pathological damage of DSS-induced chronic colitis. NK also inhibited proinflammatory cytokines production in DSS-induced colonic tissues. Mucosal integrity was maintained by NK. Moreover, nattokinase reversed DSS-induced decline of bacteria community diversity and intestinal microbial imbalance by decreasing levels of Firmicutes and increasing levels of Bacteroidetes . Tryptophan (Trp) metabolism analysis demonstrated that NK suppressed Trp catabolism especially the Kynurenine (Kyn) pathway in chronic colitis. Furthermore, NK strikingly down-regulated the protein expression of IDO-1 in chronic colitis mice. Taken together, the study demonstrated that NK relieved DSS-induced chronic colitis by regulating gut microbiota and suppressing Trp metabolism via inhibiting IDO-1. This study indicated that NK might be a promising and effective agent for IBD.
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TALANTA
·
2021
·
IF 6.057
Rong Wang,Tianfeng Wan,Wenqing Li,Zilin Chen
A novel monolithic column incorporated with Schiff base network-1 (SNW-1) was prepared for in-tube solid phase microextraction (SPME) of antiepileptic drugs . The SNW-1 nanoparticles was synthesized by a solvent thermal method and embedded in the poly(glycidyl methacrylate-ethylene glycol dimethacrylate) (GMA-EGDMA) monolithic column by in situ polymerization. The amount of SNW-1 in polymerization solution for preparation of monolithic column was optimized. Fourier transform infrared spectrometry and scanning electron microscope were used to characterize the obtained monolithic column. The SNW-1-monolithic column was connected to the high-performance liquid chromatography (HPLC) system and applied for online extraction and analysis of antiepileptic drugs. The extraction conditions including sample solution flow rate , desorption time, acetonitrile content, pH of sample solution and sample volume were investigated. Under optimal conditions, the proposed SPME-HPLC method showed high extraction efficiency, good linearity, low limits of detection (0.2 ng/mL) and good repeatability (relative standard deviations < 2.41%). This method was also applied to the analysis of antiepileptic drugs in human plasma samples and the recoveries were in the range of 88.6–106.1% with RSDs less than 3.51%.
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